<template>
  <div class="top-right-btn" :style="style">
    <el-row>
      <el-tooltip
        class="item"
        effect="dark"
        :content="showSearch ? '隐藏搜索' : '显示搜索'"
        placement="top"
        v-if="search"
      >
        <el-button circle icon="Search" @click="toggleSearch()" />
      </el-tooltip>
      <el-tooltip class="item" effect="dark" content="刷新" placement="top">
        <el-button circle icon="Refresh" @click="refresh()" />
      </el-tooltip>
      <el-tooltip
        class="item"
        effect="dark"
        content="显隐列"
        placement="top"
        v-if="Object.keys(columns).length > 0"
      >
        <el-button circle icon="Menu" @click="showColumn()" v-if="showColumnsType == 'transfer'" />
        <el-dropdown
          trigger="click"
          :hide-on-click="false"
          style="padding-left: 12px"
          v-if="showColumnsType == 'checkbox'"
        >
          <el-button circle icon="Menu" />
          <template #dropdown>
            <el-dropdown-menu>
              <!-- 全选/反选 按钮 -->
              <el-dropdown-item>
                <el-checkbox
                  :indeterminate="isIndeterminate"
                  v-model="isChecked"
                  @change="toggleCheckAll"
                >
                  列展示
                </el-checkbox>
              </el-dropdown-item>
              <div class="check-line"></div>
              <template v-for="(item, key) in columns" :key="item.key">
                <el-dropdown-item>
                  <el-checkbox
                    v-model="item.visible"
                    @change="checkboxChange($event, key)"
                    :label="item.label"
                  />
                </el-dropdown-item>
              </template>
            </el-dropdown-menu>
          </template>
        </el-dropdown>
      </el-tooltip>
    </el-row>
    <el-dialog :title="title" v-model="open" append-to-body>
      <el-transfer
        :titles="['显示', '隐藏']"
        v-model="value"
        :data="transferData"
        @change="dataChange"
      />
    </el-dialog>
  </div>
</template>

<script setup>
  const props = defineProps({
    /* 是否显示检索条件 */
    showSearch: {
      type: Boolean,
      default: true,
    },
    /* 显隐列信息（数组格式、对象格式） */
    columns: {
      type: [Array, Object],
      default: () => ({}),
    },
    /* 是否显示检索图标 */
    search: {
      type: Boolean,
      default: true,
    },
    /* 显隐列类型（transfer穿梭框、checkbox复选框） */
    showColumnsType: {
      type: String,
      default: 'checkbox',
    },
    /* 右外边距 */
    gutter: {
      type: Number,
      default: 10,
    },
  });

  const emits = defineEmits(['update:showSearch', 'queryTable']);

  // 显隐数据
  const value = ref([]);
  // 弹出层标题
  const title = ref('显示/隐藏');
  // 是否显示弹出层
  const open = ref(false);

  const style = computed(() => {
    const ret = {};
    if (props.gutter) {
      ret.marginRight = `${props.gutter / 2}px`;
    }
    return ret;
  });

  // 是否全选/半选 状态
  const isChecked = computed({
    get: () =>
      Array.isArray(props.columns)
        ? props.columns.every((col) => col.visible)
        : Object.values(props.columns).every((col) => col.visible),
    set: () => {},
  });
  const isIndeterminate = computed(() =>
    Array.isArray(props.columns)
      ? props.columns.some((col) => col.visible) && !isChecked.value
      : Object.values(props.columns).some((col) => col.visible) && !isChecked.value,
  );
  const transferData = computed(() =>
    Array.isArray(props.columns)
      ? props.columns.map((item, index) => ({ key: index, label: item.label }))
      : Object.keys(props.columns).map((key, index) => ({
          key: index,
          label: props.columns[key].label,
        })),
  );

  // 搜索
  function toggleSearch() {
    emits('update:showSearch', !props.showSearch);
  }

  // 刷新
  function refresh() {
    emits('queryTable');
  }

  // 右侧列表元素变化
  function dataChange(data) {
    if (Array.isArray(props.columns)) {
      for (let item in props.columns) {
        const key = props.columns[item].key;
        props.columns[item].visible = !data.includes(key);
      }
    } else {
      Object.keys(props.columns).forEach((key, index) => {
        props.columns[key].visible = !data.includes(index);
      });
    }
  }

  // 打开显隐列dialog
  function showColumn() {
    open.value = true;
  }

  if (props.showColumnsType == 'transfer') {
    // transfer穿梭显隐列初始默认隐藏列
    if (Array.isArray(props.columns)) {
      for (let item in props.columns) {
        if (props.columns[item].visible === false) {
          value.value.push(parseInt(item));
        }
      }
    } else {
      Object.keys(props.columns).forEach((key, index) => {
        if (props.columns[key].visible === false) {
          value.value.push(index);
        }
      });
    }
  }

  // 单勾选
  function checkboxChange(event, key) {
    if (Array.isArray(props.columns)) {
      props.columns.filter((item) => item.key == key)[0].visible = event;
    } else {
      props.columns[key].visible = event;
    }
  }

  // 切换全选/反选
  function toggleCheckAll() {
    const newValue = !isChecked.value;
    if (Array.isArray(props.columns)) {
      props.columns.forEach((col) => (col.visible = newValue));
    } else {
      Object.values(props.columns).forEach((col) => (col.visible = newValue));
    }
  }
</script>

<style lang="scss" scoped>
  :deep(.el-transfer__button) {
    border-radius: 50%;
    display: block;
    margin-left: 0px;
  }
  :deep(.el-transfer__button:first-child) {
    margin-bottom: 10px;
  }
  :deep(.el-dropdown-menu__item) {
    line-height: 30px;
    padding: 0 17px;
  }
  .check-line {
    width: 90%;
    height: 1px;
    background-color: #ccc;
    margin: 3px auto;
  }
</style>
